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Investigation of adsorption complexes in zeolites by the method of IR spectroscopy

Communication 1. The adsorption system NaA-H2O

  • Physical Chemistry
  • Published:
Bulletin of the Academy of Sciences of the USSR, Division of chemical science Aims and scope

Conclusions

  1. 1.

    A transferable vacuum cuvette, representing a miniature adsorption setup, was developed for the investigation of IR spectra. The IR spectra of adsorbed H2O on NaA zeolite were investigated as a function of the value of the adsorption. The method of optical separation of the spectral absorption bands was used.

  2. 2.

    In NaA zeolite, in the case of adsorption of up to 2 mmoles/g of H2O, there is only one form of strongly bound H2O, to which the absorption bands 3435 and 1660 cm−1, associated with ion-dipole interaction, correspond.

  3. 3.

    The following were detected by the method of optical separation of the spectra: a) a band at 3550 cm−1, which was assigned to the valence OH vibrations of the H2O molecules, bonded by H-bonds to the oxygen atoms of the zeolite lattice; b) a band at 1685 cm−1, assigned to the deformational vibration of the H2O molecule (of the type of the hydroxonium ion), bonded to the Na+ cation and interacting through a H-bond with the oxygen atom of the neighboring molecule; c) continuous absorption in the low-frequency region of the valence OH vibrations, arising during the formation of H-bonds of various strengths with the protonated hydrogen of H2O-Na+.

  4. 4.

    A correlation was established between the intensity and wave numbers of the maxima of the absorption band of the valence OH vibrations, the differential heats of adsorption, and the values of the adsorption from 0 to 5 mmoles/g on NaA. All three characteristics change sharply in the region of adsorption 2 mmoles /g.

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Authors and Affiliations

  1. Institute of Physical Chemistry, Academy of Sciences of the USSR, Moscow

    M. M. Dubinin, A. A. Isirikyan & D. I. Mirzan

Authors
  1. M. M. Dubinin
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  2. A. A. Isirikyan
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  3. D. I. Mirzan
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Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 8, pp. 1699–1705, August, 1974.

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Dubinin, M.M., Isirikyan, A.A. & Mirzan, D.I. Investigation of adsorption complexes in zeolites by the method of IR spectroscopy. Russ Chem Bull 23, 1624–1629 (1974). https://doi.org/10.1007/BF00923176

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  • DOI: https://doi.org/10.1007/BF00923176

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